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2011-Sustainable Industrial Processing Summit
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| Editors: | Florian K |
| Publisher: | Flogen Star OUTREACH |
| Publication Year: | 2012 |
| Pages: | 764 pages |
| ISBN: | 978-0-9879917-5-1 |
| ISSN: | 2291-1227 (Metals and Materials Processing in a Clean Environment Series) |
Extraction of Refractory Metals by Low Temperature Fluorination Method
Nobuaki Sato1;1TOHOKU UNIVERSITY, Sendai, Japan;
Type of Paper: Regular
Id Paper: 500
Topic: 14
Abstract:
For the recovery of refractory metals such as niobium and tantalum from their ores, fluoride extraction method was examined by the use of highly oxidative NO2-HF solvent. In this procedure, refractory metals reacted with the solvent at room temperature forming complex fluoride such as NONbF6. After the filtration, the complex fluoride was extracted into the pure HF solvent. The mutual separation of niobium, tantalum as well as titanium which were contained in the ore was made by using the solubility difference of these fluorides in HF solvent. Conditions for selective fluorination and separation were also discussed.